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There are 33 twenty-one-letter words containing E, H, I, O, Q and R

Cauchy-Riemann␣equationchicken-or-egg␣questions chicken␣or␣egg␣questionschi-square␣distributiondecahydroisoquinolinediaminoanthraquinonesdichloroquinolinolateFrench␣and␣Iroquois␣Warshydrostatic␣equilibriahydroxyanthraquinoneshydroxynaphthoquinonehyperbolic␣quaternionsin␣the␣reign␣of␣Queen␣Dickmetaxylohydroquinonesmoonlight␣requisitionsnorthern␣palm␣squirrelsperhydroisoquinolinesPort␣Macquarie-Hastingspyranonaphthoquinonesquadrature␣of␣the␣circlequantity␣theory␣of␣moneyQueen␣Charlotte␣Islandsqueering␣someone's␣pitchSchrodinger's␣equations Schrödinger's␣equationsSchroedinger␣equationsSchroedinger's␣equationShine-Dalgarno␣sequenceShockley-Queisser␣limitsquare␣peg␣in␣a␣round␣holetert-butylhydroquinonetrimethylhydroquinoneWheeler-DeWitt␣equation

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 154 words
  • Spanish Wiktionary: 2 words
  • Italian Wiktionary: no word
  • German Wiktionary: 8 words
  • Portuguese Wiktionary: 1 word
  • Dutch Wiktionary: 1 word

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